The bank also noted the rapid increase in Butler Lumber's accounts and notes payable in the recent past, especially in the spring of 2011. The usual terms of purchase in the trade provided for a discount of 2% for payments made within 10 days of the invoice date. Accounts were due in 30 days at the invoice price, but suppliers ordinarily did not object if payments lagged somewhat behind the due date. During the last two years, Butler had taken very few purchase dis- counts because of the shortage of funds arising from his purchase of Stark's interest in the business and the additional investments in working capital associated with the company's increasing sales volume. Trade credit was seriously extended in the spring of 2011 as Butler strove to hold his bank borrowing within the $250,000 ceiling imposed by the Suburban National Bank. Balance sheets at December 31, 2008-2010 and March 31, 2011, are presented in Exhibit 2.